Leases - Operating and Finance Lease Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating leases, gross lease liabilities	$ 66,269	$ 44,833
Finance leases, gross lease liabilities	25,866	30,437
Gross lease liabilities	92,135	75,270
Imputed interest - operating leases	(7,939)	(5,734)
Imputed interest - finance leases	(2,113)	(2,003)
Imputed interest	(10,052)	(7,737)
Present value of operating leases	58,330	39,099
Present value of finance leases	23,753	28,434
Present value of lease liabilities	82,083	67,533
Current portion of operating leases	(6,349)	(4,586)
Current portion of finance leases	(8,083)	(10,374)
Current portion of lease liabilities	(14,432)	(14,960)
Total long-term operating lease liabilities	51,981	34,513
Total long-term finance lease liabilities	15,670	18,060
Long-term lease liabilities	$ 67,651	$ 52,573
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other	Accrued expenses and other
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other	Accrued expenses and other
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term lease liabilities	Long-term lease liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term lease liabilities	Long-term lease liabilities